HIGHLY EFFICIENT RUN-LENGTH CODING SCHEME FOR FACSIMILE TRANSMISSION.

Mikio Takagi*, Toshitaka Tsuda

*この研究の対応する著者

    研究成果: Chapter

    4 被引用数 (Scopus)

    抄録

    Run-length coding is widely used in digital facsimile transmission as an efficient means of bandwidth compression. This paper examines a variable-length block-coding scheme which is efficient and easy to implement and, as a result, proposes a new coding scheme of higher efficiency. The proposed coding scheme is based upon the conventional variable-length block-coding method, but the efficiency is raised by utilizing all possible states, using the Golomb coding method with the multimode technique, and choosing the block length that matches the run-length distribution. Applying this method to an actual facsimile signal, an approximate improvement of 20% in compression rate is obtained over present coding methods and, with simultaneous application of two-dimensional prediction, a 40% improvement can be achieved. The construction of the encoder is also examined and it is concluded that the only change required will be to put the conventional encoders into serial connection and that a complex system is not necessary.

    本文言語English
    ホスト出版物のタイトルElectron Commun Jpn
    ページ30-38
    ページ数9
    58
    2
    出版ステータスPublished - 1975 2

    ASJC Scopus subject areas

    • 工学(全般)

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